Chapter 1: Image Analysis
Why Image Analysis? -
*The purpose of image analysis is to teach technologists how to:*
-Evaluate projections for acceptability
-Determine how to improve positioning and technical skills before repeating a projection
-Continually improve skills
It takes only __________ of rotation
to affect the appearance of the lungs -
2 to 3 degrees
The normal heart shadow will occupy ____________________ of the transverse dimension of the
thorax. -
slightly less than 50%
An optimal image of each projection demonstrates all the most desired features, which include the
following: -
-Demographic information (e.g., patient and facility name, time, date)
-Correct markers in the appropriate position without superimposing volume of interest (VOI)
-Desired anatomic structures in accurate alignment with each other
-Maximum geometric integrity
-Appropriate radiation protection
-Best possible contrast resolution, with minimal noise
-No preventable artifacts
Adjusting for Poor Display -
-Poorly displayed projections need to be adjusted before being sent to the picture archival
and communication system (PACS)
-Inaccurate manipulation can result in the right and left sides getting confused
-The marker will provide clues to the patient's orientation with the IR for the projection
Display Stations Resolution -
refers to the maximum number of pixels that the screen can demonstrate
The display monitor must be able to display -
the same number of pixels as the digital system that acquired the image can display
